Hire the Best Technical Translators
in Spain

I’m a senior web developer and IT professional with 20+ years of experience building, maintaining and improving websites, business applications, databases and internal tools. I help clients solve practical technical problems: fixing bugs, improving existing systems, creating automation scripts, working with APIs, processing data, updating legacy applications and building small tools that save time and reduce manual work. My background combines hands-on development, IT management and business understanding. This means I can work independently, understand requirements quickly, ask the right questions, and deliver solutions that are useful in real business operations — not just technically correct. My technical background includes: - Python scripting and automation - PHP development and maintenance - Classic ASP legacy application support - .NET / C# development - JavaScript, HTML and CSS - Frontend fixes and improvements - SQL Server, MySQL, Oracle and Access databases - API integrations - CSV, Excel and data processing workflows - Internal tools and business applications - Legacy system maintenance and modernization I’m especially comfortable working with existing codebases, old systems, undocumented workflows and business-critical applications that need careful, practical improvements. I can help you fix issues, clean up processes, automate repetitive tasks, improve performance, migrate small parts of a system, or simply make an existing tool easier to use and maintain. I also use modern AI-assisted development tools to speed up prototyping, debugging, documentation and workflow automation. I treat AI as a productivity tool, not as a replacement for professional judgment: every solution still needs proper review, testing and understanding of the business logic. In addition to my development background, I have extensive experience as an English-Spanish translator, editor and proofreader. This is especially useful for clients who need both technical and linguistic accuracy, such as: - Software localization - Website translation - SaaS content localization - Technical documentation - App and UI text review - AI-related content - Spanish proofreading and editing This combination of technical and language skills allows me to help with projects where code, product logic and communication all matter. Examples of tasks I can help with: - Create a Python script to automate a repetitive task - Fix bugs in a PHP, Classic ASP or .NET application - Improve an existing website or internal tool - Connect your system to an API - Clean, transform or validate CSV/Excel data - Build small admin tools or utilities - Review and improve legacy code - Document an existing workflow or system - Translate or localize your website, app or technical content into Spanish - Review Spanish UI text for accuracy, tone and clarity I’m reliable, detail-oriented and used to working independently. My goal is to understand your real business need and deliver a practical solution that works, is maintainable, and makes your day-to-day work easier. If you need someone who can combine senior technical experience, business understanding and clear communication, I’d be happy to help.

Want your message understood accurately by over 500 million Spanish speakers? Whether you’re serving Hispanic clients in the United States, expanding into Latin America, or publishing content for international audiences, clear and culturally accurate Spanish communication can make the difference between being understood and being ignored. I help law firms, healthcare organizations, businesses, and authors communicate naturally with Spanish-speaking audiences across the U.S., Latin America, and Europe—without the inaccuracies, cultural missteps, or awkward phrasing that often come with generic translation services. With 26+ years of experience and a consistent 100% Job Success Score, I provide publication-grade translations for legal, medical, marketing, technical, and full-length book projects. Clients work with me when they need a translator who understands both the language and the subject matter behind it. My clients are often trying to do more than translate words. They may be reaching Hispanic clients, localizing a website, publishing a book, supporting patients, training employees, or expanding into Spanish-speaking markets. My goal is to ensure the Spanish version feels natural, professional, and trustworthy to the people reading it. What I specialize in: Legal Translation Contracts, agreements, HR documentation, NDAs, benefit plans, immigration materials, confidentiality policies, dispute letters, and other legal or insurance-related content. I pay careful attention to terminology, jurisdiction, and tone so your documents are reliable and ready for use. Medical & Healthcare Translation Clinical reports, patient records, discharge summaries, consent forms, health questionnaires, insurance communications, and provider-facing materials. My background in psychology and experience in health and insurance operations help ensure clarity, precision, and sensitivity. Website, App & SEO Localization Corporate websites, software platforms, landing pages, marketing funnels, e-commerce content, app interfaces, and multilingual digital experiences. I adapt tone, terminology, and cultural references for U.S. Hispanic, Latin American, and European Spanish audiences. For websites and apps, I can work directly from HTML, JSON, CMS exports, and other source files while preserving structure, metadata, SEO elements, and user experience. Technical, Business & Professional Documentation Safety manuals, SOPs, training materials, product documentation, internal communications, presentations, UX/UI content, and operational documentation. I focus on clarity, consistency, and terminology accuracy so teams can rely on the final document without confusion. I can work directly from source files such as DOCX, PPTX, HTML, XML, and CMS exports, helping preserve terminology, formatting, and workflow efficiency throughout the project. Book Translation & Long-Form Projects Novels, memoirs, educational content, and non-fiction manuscripts. I work closely with authors and publishers to preserve voice, rhythm, humor, emotion, and pacing so the Spanish version feels like an original work. For authors working in Adobe InDesign, providing an IDML export allows me to preserve formatting, styles, and layout throughout the translation process. How I Work • I ask clear questions instead of guessing. • I maintain consistent terminology using glossaries and CAT tools when appropriate. • I preserve or rebuild formatting so files are ready to use. • I communicate responsibly and meet deadlines. • I handle all content—especially legal and medical materials—with confidentiality. I work with Word, Google Docs, PDFs/scans, Adobe, WordPress, PowerPoint, Excel, JSON, XLIFF, SRT subtitles, and other structured formats. When needed, I use OCR and DTP tools to replicate complex layouts and preserve document integrity. Who I’m a Good Fit For • Law firms and legal departments • Healthcare providers, clinics, and insurance companies • SaaS and technology companies with English documentation • International businesses expanding into Spanish-speaking markets • Authors and publishers seeking a culturally faithful Spanish edition • Organizations that need precise, polished communication rather than quick machine-generated output When projects require CAT tools or client-specific workflows, I work with Trados, MemoQ, Wordfast, Smartcat, and other translation platforms. Whether you’re translating a contract, a medical document, a website, or an entire book, my goal is the same: to make your Spanish content read naturally, accurately, and professionally from the very first draft. Send a sample or project brief, and I’ll provide a clear quote, timeline, and recommendations for terminology, formatting, and workflow.

✨ As a professional and experienced translator and proofreader, I will help you with all your localization needs: •​Websites/apps/software💻​📱 •Technical documents (brochures, manuals and guides, leaflets)📄​ •Audiovisual material (subtitles, SDH, transcriptions, audio description)🔤​ •Marketing content (SEO, Keywords, landing pages)🌐 •Online content (Facebook, Instagram, Linkedin, Twitter, YouTube)🏷️​ •Books, short stories, autobiographies📚​ •Product descriptions📦 •General content🔄​ ✨Why you should hire me? -High-quality translations and writings: 100% human work -Detailed oriented, responsible, efficient, time management, flexibility -WordPress, HTML, XML, XLIFF knowledge -CAT Tools: Trados Studio 2021, memoQ, OmegaT, Notepad ++ -SEO knowledge -I am familiar with a variety of translation platforms, including Crowdin, Smartcat, Lokalise, Poedit and Memsource -Continuous training: the world is changing fast so is technology, education, and health. I'm always taking different courses to improve my skills and be up-to-date. I pride myself on establishing and maintaining strong relationships with my clients, understanding their business needs and target audience, and providing them with content that exceeds their expectations. Let's talk!

I am a professional technical translator/proofreader. I am also a liaison/business interpreter with a 10-year experience and an English tutor with a 20-year experience. Interpreting is my passion and teaching is my vocation. I am always willing to help, assist and support you during business or personal meetings, negotiations or visits to the factory, onsite or remotely. My professional experience is diverse. My customers belong to the following industries: aeronautics, production of steel structures, hot-dip galvanizing, overhead transmission lines, energy and power energy, construction, elections and politics, psychology and psychological trainings, social work, beer market tours, solar energy, football, IT, beauty (brows, esthetic medicine), real estate. I give English lessons to teenagers and adults, preparing them for exams, job interviews, general and business communication. I organise group classes for the company staff. I am responsible and have a can-do attitude. Therefore, most of my clients are satisfied with my services and return to me again and again.

I was born in Spain but I grew up in Spain, Ireland, and France. I have a Bachelor in Chemistry, an MBA and a Master in Teaching. I have been teaching languages and sciences for more than 20 years, in different schools and privately. I have taught English, Spanish and Italian as second languages, and also Physics, Chemistry, and Maths, also to High School students, always with very good results. I have also been teaching in a Business School different subjects, such as Marketing and International Trade. I have made professional translations for Art Shows, web pages, technical books, books for children and short business articles. I have also written a chapter in a big project from Thompson-Reuters Aranzadi : "La Franquicia" (The Franchise), where I try to describe all the inputs needed to get a firm international if franchising is the way chosen to do it. I have traveled widely all over the world, learning from every place I visited, and I consider myself a well educated and cultured person, serious in my commitments, with a very positive attitude in life. Organization an planning, analytic mind, and communication are also other important skills I am good at. I love sports, basketball is one of my passions, but I have practiced, and I still do, other sports such us skying, swimming, tennis...

You offer a fantastic product or service that you would like to promote globally? You want content that stands out, engages your clients, and gets you results? That’s where I come in. ⭐ Over 10 years of Upwork experience ⭐ CERTIFIED in PPC by Google Ads ⭐ CERTIFIED in Content & Inbound Marketing by HubSpot ⭐ TOP-RATED FREELANCER with over 95% success rate since 2015 ⭐ 🇪🇸 (NATIVE) 🇺🇸 (FLUENT) ⭐ Global perspective (Lived in SPAIN, DENMARK, UK, FINLAND) ⭐ The only Spanish freelance translator / writer on the platform with university-level background in marketing, engineering, and finance ===== WHAT MY CLIENTS SAY ===== “This was my first time working with Sergio, and it was a very positive experience. He translated our sales presentation from English into European Spanish, as requested, and did additional corrections and options, when requested from my colleague, with no break in his stride. He even offered to check the final look of the Spanish translation to make sure it reached the best level of quality. As a Spanish translator, his communication and adherence to deadlines are top notch! I will be using Sergio’s translation services for further work with us.” – Mirjana Ilisinovic of Creatriks d.o.o. “We hired Sergio as an English to Spanish translator. He not only did his job well, but also suggested improvements for the rest of our existing app store description. Very engaged and supportive. Recommended! Will be in touch with him for future projects.” – Ana Timofeeva of Sphere Identity “Excellent communication, and Sergio also helped us pinpoint a bug in the app, so he went beyond the scope of his role as Spanish translator and helped us a lot. Outstanding work! – Mile Rosu of Pressinfra SRL ===== WHAT I CAN DO FOR YOU ===== Taken straight from my Upwork profile, the testimonials above prove that I deliver. I will make your product or business shine—on time and totally stress-free! A Spanish native with over 10 years experience in translation, proofreading, and copywriting in a variety of sectors, including marketing, engineering, and finance, I am perfectly fluent in English (US/UK). Here's how I can help you: ✓ Expert technical translation / content creation and software documentation for developers and users. ⇒ Bridge the gap between technical knowledge and layman's terms ✓ Result-driven translation and localization of your websites, apps, and software, so you get perfectly localized and formatted strings. ⇒ Save time with someone who understands UX constraints and code ✓ Engaging translation and localization of your texts for your target audience, while retaining their original style and meaning. ⇒ Make profit globally ✓ SEO friendly content creation using carefully crafted words to engage, connect with, and convince your audience—visitors to your website, prospects scanning your landing page or reading your sales letter or email ⇒ Better conversion rates Let me put my enthusiasm and expertise to your service! ===== WHAT I OFFER ===== ⇨ CONTENT TRANSLATION, LOCALIZATION, AND OPTIMIZATION o Proofreading / Editing and Optimization o General Translation o Research Paper / White Paper / Technical Translation / Software Documentation o Website, App, and Software translation and localization ⇨ CONTENT CREATION o Software / technical documentation (experience in C, C++, Java, Swift, PHP, JavaScript, SQL, C#) o Tutorials and How-to Guides o Blog and article writing (project management, software development, languages, lifestyle, health, and fitness) o UX writing o Copywriting Don't see what you're looking for? Reach out and ask! I can provide you with content that will make your product or service shine in Spanish or English! With each package, you also get: ✓ Quality content, thoroughly proofread and optimized ✓ Attention to details ✓ Full commitment—I’m here to help you succeed! ✓ Always on time ===== LET'S DO GREAT THINGS TOGETHER ! ===== If you have the same standards of excellence for your business as I have for mine, and you are fully aware of what great quality content can bring to your business, I’m sure we’d make a great team! Click the green “Invite” or “Hire now” button at the top of the page, and let’s discuss your project!